~ 5.13 ~

Expressions with Rational Numbers

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Learning Targets

I can add, subtract, multiply, and divide rational numbers.
I can evaluate expressions that involve rational numbers.

Notes

We can represent sums, differences, products, and quotients of rational numbers, and combinations of these, with numerical and algebraic expressions.

We can write the product of two numbers in different ways.

By putting a little dot between the factors, like this: - 8.5 • x.
By putting the factors next to each other without any symbol between them at all, like this: - 8.5x.

Substitution with negative numbersPractice plugging in values to evaluate negative number addition and subtraction expressions.

Negative signs in fractionsPractice rewriting fractions with positive and negative denominators.

Ordering negative number expressionsPractice solving challenging negative number addition and subtraction problems. Number line models, variables, and absolute value come together to push your knowledge of negative numbers even deeper (maybe even below zero!).

Signs of expressionsPractice finding the signs of the answers to multiplication and division problems with positive and negative numbers.

Activities

13.1 True or False: Rational Numbers

Decide if each statement is true or false. Be prepared to explain your reasoning.

( - 38.76) ( - 15.6)
10,000 - 99,999 < 0
(3/4) ( -4/3) = 0
(30)(- 80) - 50 = 50 - ( 30) (-80)

13.2 Card Sort: The Same But Different

Math 7 Unit 5 Lesson 13 Activity 2 Card Sort: The Same But Different

Here is a set of cards. Group them into pairs of expressions that have the same value.

Summary

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